Development of an Environmental Control System for Stable and Rapid Mass-Production of Quality Transplants under Artificial Light

作为该研究项目的第一步，开发了一个实验性人工照明系统，用于生产优质移植物。人工照明系统的光源由蓝色、绿色和红色发光二极管组成。蓝色、绿色和红色发光二极管的光输出可以手动修改。利用该系统，研究了蓝光、绿色和红光比例对番茄幼苗生长发育的影响。光能组成对移栽苗的生长发育有显著影响。其次，进行了低温贮藏条件下移栽苗的品质保存试验。实验表明，在弱光下贮藏比在黑暗下贮藏品质更好。第三，在移植生产过程中，照明和空调的电力成本估计约为2日元/移植。这一结果表明，在人工光下的移植生产可以商业化。对甘薯移栽生产中的CO_2浓度、甘薯插穗的蒸腾和光合特性进行了试验，取得了较好的效果。

As the first step of this research project on the development of artificial lighting system for producing quality transplants, an experimental artificial lighting system was developed. The light source of artificial lighting system was consisted of blue, green and red light emitting diodes. The light output of blue, green and red light emitting diodes could be modified by manual. Using this system, the effect of blue, green and red light ratios on the growth and development of tomato seedling was investigated. A significant effect of light energy composition on the growth and development was found. Secondaly, an experiment on quality preservation of transplants during the low temperature storage was conducted. The experiment showed that the quality was better preserved under dim light than under darkness. Thirdly, the cost of electricity for lighting and air conditioning during the transplant production was estimated to be about 2 Yen/transplant. This results shows that the transplant production under artificial light can be commercialized. Experiments on carbon dioxide enrichment for sweetpotato transplant prduction, transpirational and photosynthetic characteristics of sweetpotato cuttings were conducted and fruitful results were obtained.